1: Wrong.@ bold part, wtf ?
Obito has not senjutsu, he just has Hagoromo's chakra not Hagoromo's Senjutsu chakra. Obito had only Rikudou Senjutsu while being Juubi Jinchurki.
Also you are wrong that Onmyoudon has nothing to do with goudama
Onmyoudon is goudama + erasive ninjutsu ability of yin/yang release.
That why Hiruzen could regenerate while Minato couldn't.
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I'm done here.